CN221750737U - Degradable self-breaking craniomaxillofacial bone screw - Google Patents
Degradable self-breaking craniomaxillofacial bone screw Download PDFInfo
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- CN221750737U CN221750737U CN202323265642.8U CN202323265642U CN221750737U CN 221750737 U CN221750737 U CN 221750737U CN 202323265642 U CN202323265642 U CN 202323265642U CN 221750737 U CN221750737 U CN 221750737U
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Abstract
本实用新型公开一种可降解自断式颅颌面接骨螺钉，颅颌面接骨螺钉采用镁合金材质，包括钉体、自断部以及握持部；钉体的外部设置有全螺纹，尾部设置有；钉帽的中部向内形成凹槽结构；自断部与凹槽结构的底部连接，且自连接处呈渐缩状与握持部的头部连接；握持部为一柱状结构，且头部呈渐缩状与自断部连接。本实用新型增加自断结构，使螺钉在植入时更易于传递扭矩进行旋入操作且植入完成后可以进行自断，避免手术中螺钉掉落寻找难的问题，提高手术的效率。
The utility model discloses a degradable self-breaking craniomaxillofacial bone screw. The craniomaxillofacial bone screw is made of magnesium alloy and includes a nail body, a self-breaking part and a gripping part. The outside of the nail body is provided with a full thread, and the tail is provided with a screw cap. The middle part of the nail cap forms a groove structure inward. The self-breaking part is connected to the bottom of the groove structure, and the self-connection part is connected to the head of the gripping part in a tapered shape. The gripping part is a columnar structure, and the head is connected to the self-breaking part in a tapered shape. The utility model adds a self-breaking structure, so that the screw is easier to transmit torque for screwing in during implantation and can be self-broken after implantation, avoiding the problem of screws falling off and being difficult to find during surgery, thereby improving the efficiency of surgery.
Description
Technical Field
The utility model relates to a bone screw, in particular to a degradable self-breaking craniomaxillofacial bone screw.
Background
The titanium alloy materials are mainly used in the prior market, but the titanium alloy cannot be degraded after being implanted into a human body, and needs to be remained in the human body for a long time. With the increasing demands of people for quality of life, screws implanted in the body are often required to be removed, thereby bringing the risk of repeated infection and enlarged facial lesions. The subsequent polylactic acid material has weaker strength and strict requirements on the applicable parts. The magnesium alloy material has been used to some extent in the field of bone screws based on its degradable property.
The craniomaxillofacial bone screw is mainly used for internal fixation of craniomaxillofacial fracture. In order to meet the requirements of patients on facial beauty, the craniomaxillofacial bone screw needs to be designed in a miniaturized way. The traditional screw adopts the cross pin head to transmit torque so as to realize the screw screwing, but the clamping and the orientation can not be better carried out when the craniomaxillofacial screw is implanted, if the screw drops carelessly, the screw can be difficult to find under the operation environment, and the operation efficiency is affected.
Disclosure of utility model
In view of the above-mentioned drawbacks of the prior art, an object of the present utility model is to propose a degradable self-breaking craniomaxillofacial nail.
The utility model provides a degradable self-breaking craniomaxillofacial bone screw which is made of magnesium alloy material and comprises a screw body, a self-breaking part and a holding part; the outer part of the nail body is provided with a full thread, and the tail part of the nail body is provided with a nail cap; the middle part of the nail cap inwards forms a groove structure; the self-breaking part is connected with the groove structure, and the self-connecting part is in a tapered shape and is connected with the head of the holding part; the holding part is of a columnar structure, and the head part is connected with the self-breaking part in a tapered manner.
Optionally, the self-breaking portion is lower than a nut of the nail body.
Optionally, the holding part is in a triangular prism structure, and the diameter of the outer circle of the triangular prism is larger than the diameter of the nail head.
Optionally, the length of the grip is greater than the length of the shank.
Optionally, the groove structure is an arc-shaped groove; the minimum diameter of the arc-shaped groove is smaller than 2mm, and the arc is used for transition to provide enough torque.
The degradable self-breaking craniomaxillofacial bone screw provided by the utility model adopts the degradable magnesium alloy as a processing material, improves the traditional screw head screwing-in structure, increases the self-breaking structure, ensures that the screw is easier to transmit torque for screwing-in operation during implantation and can be self-broken after implantation is completed, avoids the problem that the screw is difficult to find due to falling in operation, and improves the operation efficiency.
Drawings
FIG. 1 is a schematic diagram of a degradable self-breaking craniomaxillofacial bone screw according to the present utility model;
Fig. 2 is an enlarged view of a portion of the degradable self-breaking craniomaxillofacial bone screw of the present utility model.
Detailed Description
The technical means adopted by the utility model to achieve the preset aim are further described below by matching with the drawings and the preferred embodiments of the utility model.
As shown in fig. 1 and 2, the degradable self-breaking craniomaxillofacial bone screw provided by the utility model is integrally formed by adopting a magnesium alloy material and comprises a screw body 1, a self-breaking part 2 and a holding part 3; the nail body 1 is connected with the holding part 3 through the self-breaking part 2.
The outside of the nail body 1 is provided with a full thread, and the tail part is provided with a nail cap 11; the middle part of the nut 11 is formed with a groove structure inwards. Wherein, the groove structure preferably adopts an arc-shaped groove, and the bottom is of a plane structure and is connected with the self-breaking part 2. The design surface of the arc-shaped groove is smooth and transits, and no stress concentration part is generated, so that the screw has a stable structure. Preferably, the arcuate groove structure has a minimum diameter of < 2mm, and the transition is made with an arcuate shape to provide sufficient torque to facilitate breakage after implantation is complete.
The self-breaking part 2 is connected with the bottom of the groove structure of the nail body 1, and is connected with the head of the holding part 3 in a tapered shape from the connecting part. The tapered self-breaking portion 2 may be tapered with an arc surface or a straight inclined surface, so that the narrowest tapered portion is used as a connection position of the self-breaking portion 2. For example, the self-breaking portion 2 is shown as tapered in a cambered surface to allow smooth transition of the surface. The height of the self-breaking part 2 is required to be lower than the edge of the nut 11 of the nail body 1. For example, alternatively, the distance from the break 2 below the nut 11 of the shank 1 is 0.3mm. The utility model can ensure that the broken part can be hidden in the nail cap 11 by setting the self-breaking part 2 lower than the nail cap 11, wherein the broken surface of the self-breaking part 2 can not contact with surrounding soft tissues, and the soft tissues can not be scraped to cause secondary injury to a patient.
The grip portion 3 has a columnar structure including a main body 31, a head portion 32 and a tail portion 33. The head 32 is tapered and connected with the self-breaking portion 2, and the tail 33 may have an arc structure, so as to avoid the risk of scratching during use. Since the shank 1 of the craniomaxillofacial bone screw is small, the length of the grip 3 is preferably greater than the length of the shank 1 in order to enable the grip 3 to provide sufficient torque. For example, alternatively, the main body of the holding part 3 adopts a triangular prism structure, the diameter of the outer circle of the triangular prism is slightly larger than that of the nail body 1, and the length is designed to be 80mm, so that a good holding force can be provided for doctors.
When the bone screw is used, a doctor can hold the holding part 3 of the bone screw by hand, and the position of the screw body 1 can be screwed into the craniofacial or maxillofacial region by rotating the holding part 3. Because the head position of the holding part 3 and the self-breaking part 2 are tapered, a doctor can break the screw at the connecting part of the holding part 3 and the self-breaking part 2, namely the thinnest part, through stress without auxiliary operation of an external tool. And then gelatin can be smeared on the broken part, and the gelatin is in a liquid state before use, can be conveniently smeared on the residual end of the self-breaking part 2 and is used for covering the broken surface so as to prevent the situation that the nail body 1 is degraded too quickly and absorbed due to the broken surface of the part.
Based on the above, the magnesium alloy material adopted by the craniomaxillofacial bone screw can realize holding force for 3-6 months after being implanted into a human body, effectively provides the fixing effect of the bone healing stage, can be completely degraded in the human body, does not need to be taken out by secondary operation, and reduces the burden of a patient. In addition, the junction of the self-breaking part 2 and the holding part 3 is the thinnest position, and the self-breaking can be completed without the assistance of other tools, so that the problems of infection and screw loss and difficult searching caused by the matching of the self-breaking part and the other tools are avoided.
The above description is only of the preferred embodiments of the present utility model, and is not intended to limit the present utility model in any way, although the present utility model has been described above with reference to the preferred embodiments, but is not limited thereto, and any person skilled in the art will appreciate that the present utility model can be embodied in the form of a program for use herein without departing from the scope of the present utility model, while the above disclosure is directed to various equivalent embodiments, which are capable of being modified or varied in several ways, it is apparent to those skilled in the art that many modifications, variations and adaptations of the embodiments described above are possible in light of the above teachings.
Claims (5)
1. The degradable self-breaking craniomaxillofacial bone screw is characterized by adopting a magnesium alloy material and comprising a screw body, a self-breaking part and a holding part; the outer part of the nail body is provided with a full thread, and the tail part of the nail body is provided with a nail cap; the middle part of the nail cap inwards forms a groove structure; the self-breaking part is connected with the groove structure, and the self-connecting part is in a tapered shape and is connected with the head of the holding part; the holding part is of a columnar structure, and the head part is connected with the self-breaking part in a tapered manner.
2. The degradable self-breaking craniomaxillofacial bone screw of claim 1, wherein the self-breaking portion is lower than a nut of the shank.
3. The degradable self-breaking craniomaxillofacial bone screw of claim 1, wherein the grip is in a triangular prism configuration and the diameter of the outer circumference of the triangular prism is greater than the diameter of the pin.
4. The degradable self-breaking craniomaxillofacial bone screw of claim 1, wherein the length of the grip is greater than the length of the pin.
5. The degradable self-breaking craniomaxillofacial bone screw of claim 1, wherein the groove structure is an arcuate groove; the minimum diameter of the arc-shaped groove is smaller than 2mm, and the arc is used for transition to provide enough torque.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323265642.8U CN221750737U (en) | 2023-12-01 | 2023-12-01 | Degradable self-breaking craniomaxillofacial bone screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323265642.8U CN221750737U (en) | 2023-12-01 | 2023-12-01 | Degradable self-breaking craniomaxillofacial bone screw |
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| Publication Number | Publication Date |
|---|---|
| CN221750737U true CN221750737U (en) | 2024-09-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323265642.8U Active CN221750737U (en) | 2023-12-01 | 2023-12-01 | Degradable self-breaking craniomaxillofacial bone screw |
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| Country | Link |
|---|---|
| CN (1) | CN221750737U (en) |
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2023
- 2023-12-01 CN CN202323265642.8U patent/CN221750737U/en active Active
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